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Thread: Backend crash

Backend crash

From
Mark Volpe
Date:
The following sequence causes PostgreSQL to
crash on my Linux box:

-- Any example table here will do

CREATE TABLE numbers ( value int );
INSERT INTO numbers VALUES(1);
INSERT INTO numbers VALUES(2);
INSERT INTO numbers VALUES(3);
INSERT INTO numbers VALUES(4);

-- Now the crash sequence

BEGIN;
SELECT * INTO TEMP numbers2 FROM numbers;
SELECT * FROM numbers2;

-- Bang!!! --

Can anybody reproduce this?

Thanks,
Mark

Re: [SQL] Backend crash

From
Tom Lane
Date:
Mark Volpe <volpe.mark@epamail.epa.gov> writes:
> BEGIN;
> SELECT * INTO TEMP numbers2 FROM numbers;
> SELECT * FROM numbers2;
> -- Bang!!! --
> Can anybody reproduce this?

Yah :-(.  There are several nasty bugs in 6.5.*'s support for TEMP
tables.  We believe they are all fixed for 7.0, but the changes are
intertwined with a lot of other stuff, and so back-patching the fixes
didn't look very practical.

The only good news is that 7.0 goes beta next week...
        regards, tom lane

Re: [SQL] Backend crash

From
Bruce Momjian
Date:
> The following sequence causes PostgreSQL to
> crash on my Linux box:
> 
> -- Any example table here will do
> 
> CREATE TABLE numbers ( value int );
> INSERT INTO numbers VALUES(1);
> INSERT INTO numbers VALUES(2);
> INSERT INTO numbers VALUES(3);
> INSERT INTO numbers VALUES(4);
> 
> -- Now the crash sequence
> 
> BEGIN;
> SELECT * INTO TEMP numbers2 FROM numbers;
> SELECT * FROM numbers2;
> 
> -- Bang!!! --
> 
> Can anybody reproduce this?

Fixed in current source tree.  We had some problems with temp tables
created inside transactions.  Next release will fix this.

--  Bruce Momjian                        |  http://www.op.net/~candle pgman@candle.pha.pa.us               |  (610)
853-3000+  If your life is a hard drive,     |  830 Blythe Avenue +  Christ can be your backup.        |  Drexel Hill,
Pennsylvania19026

Re: [SQL] Backend crash

From
Mark Volpe
Date:
Thanks, guys!

SELECT * INTO <good-old-unique-name-based-on-process-id> ...
works just fine for me :-)

Tom Lane wrote:
> 
> Mark Volpe <volpe.mark@epamail.epa.gov> writes:
> > BEGIN;
> > SELECT * INTO TEMP numbers2 FROM numbers;
> > SELECT * FROM numbers2;
> > -- Bang!!! --
> > Can anybody reproduce this?
> 
> Yah :-(.  There are several nasty bugs in 6.5.*'s support for TEMP
> tables.  We believe they are all fixed for 7.0, but the changes are
> intertwined with a lot of other stuff, and so back-patching the fixes
> didn't look very practical.
> 
> The only good news is that 7.0 goes beta next week...
> 
>                         regards, tom lane
> 
> ************

Re: [SQL] Backend crash

From
Bruce Momjian
Date:
> Thanks, guys!
> 
> SELECT * INTO <good-old-unique-name-based-on-process-id> ...
> works just fine for me :-)

There is a section in my book about it.

> 
> Tom Lane wrote:
> > 
> > Mark Volpe <volpe.mark@epamail.epa.gov> writes:
> > > BEGIN;
> > > SELECT * INTO TEMP numbers2 FROM numbers;
> > > SELECT * FROM numbers2;
> > > -- Bang!!! --
> > > Can anybody reproduce this?
> > 
> > Yah :-(.  There are several nasty bugs in 6.5.*'s support for TEMP
> > tables.  We believe they are all fixed for 7.0, but the changes are
> > intertwined with a lot of other stuff, and so back-patching the fixes
> > didn't look very practical.
> > 
> > The only good news is that 7.0 goes beta next week...
> > 
> >                         regards, tom lane
> > 
> > ************
> 
> ************
> 
> 


--  Bruce Momjian                        |  http://www.op.net/~candle pgman@candle.pha.pa.us               |  (610)
853-3000+  If your life is a hard drive,     |  830 Blythe Avenue +  Christ can be your backup.        |  Drexel Hill,
Pennsylvania19026